O-benzyl-O-ethyl-O-2,4,5-trichlorophenyl phosphorothioate

ABSTRACT

The compounds are useful as insecticides and miticides.   WHEREIN R3 can be selected from hydrogen, alkyl, thioalkyl, nitro, halogen, cyano and mixtures thereof; R4 can be hydrogen or alkyl; R5 can be hydrogen or alkyl; m is a whole number ranging between 1 and 4; provided that when n is zero then R2 is   WHEREIN R can be selected from the group consisting of hydrogen, nitro, halogen, alkoxy, alkyl and dioxyalkynyl; R1 can be selected from alkyl and alkoxy; X can be sulfur or oxygen, n is zero or one and R2 can be selected from hydrogen, thioalkyl, cyano, thioalkyl, thioalkylaryl, alkynyl, and a mono or multisubstituted group represented by   New compounds having the generic formula:

United States Patent [191 Gutman Apr. 1, 1975 4] 0-BENZYL-0-ETl-lYL-0-2,4,5-

TRICHLOROPHENYL PHOSPHOROTHIOATE [62] Division of Ser. No. 123,410, March 11, 1971. Pat.

[52] U.S. Cl 260/964, 260/940, 424/225 [51] Int. Cl. C07f 9/08, AOln 9/36 [58] Field of Search 260/964 [56] References Cited UNITED STATES PATENTS 6/1959 Britton et a1 260/964 2/1972 Schradcr et a1 260/964 X Primary Examiner-Anton H. Sutto Attorney, Agent, or Firm-Daniel C. Block [57] ABSTRACT New compounds having the generic formula:

wherein R can be selected from the group consisting of hydrogen, nitro, halogen, alkoxy, alkyl and dioxyalkynyl; R, can be selected from alkyl and alkoxy; X can be sulfur or oxygen, n is zero or one and R can be selected from hydrogen, thioalkyl, cyano, thioalkyl, thioalkylaryl, alkynyl, and a mono or multisubstituted group represented by wherein R can be selected from hydrogen, alkyl, thioalkyl, nitro, halogen, cyano and mixtures thereof; R can be hydrogen or alkyl; R, can be hydrogen or alkyl; m is a whole number ranging between 1 and 4; provided that when n is zero then R, is

The compounds are useful as insecticides and miticides.

l Claim, No Drawings 1 O-BENZYL-O-ETHYL-O-2,4,5- TRICHLOROPHENYL PHOSPHOROTHIOATE This is a division, of application Ser. No. 123,410, filed Mar. 11, 1971, now US. Pat. No. 3,780,143.

DESCRIPTION OF THE INVENTION This invention is directed to a novel group of compounds which may be generally described as phosphorus derivatives which are active insecticides and miticides. The compounds of the present invention are represented by the generic formula:

wherein R can be selected from hydrogen, alkyl, thioalkyl, nitro, halogen, cyano and mixtures thereof; R can be hydrogen or alkyl; R can be hydrogen or alkyl; m is a whole number ranging between 1 and 4; provided that when n is zero then R is In general, the above-noted compounds can be prepared by reacting an appropriate alcohol with ethylthiophosphine sulfide to form a reactive mercaptan. The mercaptan is then treated with a halide compound in the presence ofa base such as triethylamine to form the end product. In the alternative, the mercaptan can be reacted with a chlorinating agent, such as sulfuryl chloride, to form the chloridate which can be further reacted with an appropriate compound in the presence of a base to form the end product. Another method involves the reaction of an appropriate alcohol with a dihalothiophosphorous derivative to obtain a reactive thiochloridate phosphorous intermediate which is reacted with an appropriate compound to form the end product.

In order to illustrate the merits of the present invention the following examples are provided:

EXAMPLE 1 0-( 4-nitrobenzyl ),ethyl-S-(propargyl )phosphonodithioate To a one liter flask was added 200 ml. of dioxane and 6.2 g. (0.025 moles) ethylthionophosphine sulfide. The mixture was stirred at room temperature and then 7.65 g. (0.05 moles) of 4-nitrobenzyl alcohol was added.

The temperature rose to 30C. and the solution became clear. The resulting solution was stirred at 30C. for 30 minutes, cooled in an ice bath to 10. Then, 5.95 g. (0.05 moles) of propargylbromide was added at once and/or along with 10.1 g. of triethylamine was added over a period of 10 minutes and at such a rate that the temperature did not exceed 20C. The mixture was stirred at room temperature for 1 hour, poured into 500 ml. of benzene, washed with 200 ml. of water, ml. of saturated sodium bicarbonate, twice with 100 ml. of water and dried over magnesium sulfate and evaporated. The yield was 1 1.1 g. having 22,, 1.5745.

EXAMPLE 2 0-( Z-methoxybenzyl'),ethyl-S-methylphosphonodithioate To a one liter flask was added 12.4 g. (0.05 moles) of ethylthionophosphine sulfide and 200 ml. of dioxane. The mixture was stirred at room temperature and then 13.8 g. (0.1 mole) of 2-methoxybenzyl alcohol was added. The temperature rose to 30C. and the solution became clear. The resulting solution was stirred at 30 for 30 minutes, then cooled in an ice bath to 10. Then, 14.2 g. (0.01 mole) of methyl iodide was added at once and then 15.1 g. (0.15 mole) of triethylamine was added over a period of ten minutes, and at such a rate that the temperature did not exceed 20C. The mixture was stirred at room temperature for 1 hour, poured into 500 ml. of benzene, washed with 200 ml. of water, 100 ml. of saturated sodium bicarbonate, and twice with 100 ml. of water, dried over magnesium sulfate and evaporated to yield 21 g. of product, m, 1.5677.

EXAMPLE 3 O-benzyl-O-ethyl phosphorothiochloridate 54 g. (0.5 mole) of benzyl alcohol, 56 g. (0.5 mole) of potassium t-butoxide and 500 ml. of tetrahydrofuran was combined and heated under reflux for 1 hour. The resulting solution was cooled to room temperature and was added over a period of 1 hour to a stirring solution of 89.5 g. (0.5 mole) of ethyl dichlorothiophosphate. The reaction temperature during the addition was maintained at -10 to 5. After the addition was complete, the mixture was allowed to warm to room temperature and was stirred for 1 hour. The mixture was then poured into 500 ml. of benzene and was washed with three 300 ml. portions of water. The benzene phase was dried with anhydrous MgSO and evaporated under reduced pressure to yield 101 g. of the desired product, m, 1.5347.

EXAMPLE 4 0-benzyl-0-(4-cyanophenol), ethyl phosphorodithioate 4.75 g. (0.04 mole) of 4-cyanophenol was combined with 1.6 g. (0.04 mole) of a caustic and 20 ml. of water in a 500 ml. three-neck flask fitted with a stirrer, thermometer, and dropping funnel. The mixture was stirred and 10.0 g. (0.04 mole) of the product of Example 3 in 200 ml. of tetrahydrofuran was added over a period of 30 minutes. The resulting mixture was stirred and heated under reflux for two hours, cooled and poured into 400 ml. of benzene. The benzene mixture was washed with 200 ml. of water, 200 ml. of dilute caustic solution, followed by two 200 ml. portions of water. The benzene phase was dried with anhydrous MgSO and evaporated under reduced pressure to yield 10.0 g. (86.7% theory) of product. 11,?" 1.5477. cl

EXAMPLE 5 0-benzyl,ethyl phosphonothiochloridate 108 g. (1.0 mole) of benzyl alcohol, 124 g. (0.5 mole) of ethylthionophosphine sulfide was combined with 400 ml. of benzene in a one 1. three-neck flask fitted with a stirrer, thermometer, condenser and dropping funnel. The mixture was stirred at 4050C. for 1 hour until a clear solution was obtained. The temperature was maintained at 40-50 and 135 g. (1.0 mole) of sulfuryl chloride was added over a period of 30 minutes. After the addition was complete, the mixture was stirred at 4050 for an additional 30 minutes. The solvent was removed under aspirator pressure and the residue distilled in vacuo to yield 101 g. Bp. l 14-120/100 EXAMPLE 6 TABLE 6.2 g. (0.042 mole) of 4-chlorothiophen0l was combined with 1.7 g. (0.042 mole) of caustic and 20 ml. of water in a 500 ml. three-neck flask fitted with a stirrer, thermometer, and dropping funnel. The mixture was stirred and 10.0 g. (0.042 mole) of the product of Example 5 in 200 ml. of tetrahydrofuran was added over a period of 30 minutes. The resulting mixture was stirred and heated under reflux for two hours, cooled and poured into 400 ml. of benzene. The benzene mixture was washed with 200 ml. of water, 200 ml. of dilute caustic solution, followed by two 200 ml. portions of water. The benzene phase was dried with anhydrous MgSO and evaporated under reduced pressure to yield 11.0 g. of product. n 1.6182

Other compounds were prepared in an analogous manner starting with the appropriate materials as outlinedabove. The following is a table of compounds representative of those embodied by the present invention. Compound numbers have been assigned to them and are used for identification throughout the balance of the specification.

0 d AL a 2 3 B 1 1 1 1 S 4-N02 5 2 1 1 s 2% 3 1 1 s 4-c1 c 11 5 l 1 S 4-Cl C2115 6 1 1 s a c 11 7 a 1 1 s a 6 115 8 1 1 S H CZHS 9 1 1 S H C2115 1o 1 I 1 Y s 2-ocn c 11 11 1 1 s' z-ocu c 11 12 1 1 s 2-oca c 11 14 1 1 s cgz wr c 11 Q- 15 1 1 s cg) 3,4 c 11 16 1 1 s oa 3,4 c 11 o- 17 1 1 s of 3,4 c 11 18 1 1 s of 3,4 c 11 19 1 o s H c 11 2 3 4 5 CECE H H H 11 SCZHS c==ca H H on H H u 11 50 11 cu H H a H i H c cti H H H n scn 11 a 1-1 c=ca H H a sc u H a sca H H H H 4-c1 u n TABLE 1 gcont.)

C ound 11 1 1 1 s 1 11 1 1 1 o s 11 0 11 Q 4-c11 11 11 21 1 o o 11 0 11 G 4-110 11 11 3-011 22 1 o 0 11 c 11 3 11 11 Q 1. 23 1 o s 11 oc 11 Q 4-c1 11 11 24 1 o s 11 00 11 Q 11 11 11 25 1 o 0 11 0 11 G a-c n 11 11 26 1 0 0 11 oc 11 Q 3-0211 11 11 27 1 o o 11 00 11 Q 2,4,s-c1 11 11 3-011 2s 1 o o 11 0c 11 3 11 11 25 Q 1 i 29 1 o 0 11 00 11 Q 4-110 11 11 so 1 V o o 11 011 11 1 Q a-cr 11 11 31 1 o s 11 oc 11 Q 3-c11 11 11 32 1 l S H C2115 can H CH3 33 1 1 s 11 0 11 0511 11 011 34 1 1 s 11 0 11 $011 11 C11 35 2 1 s 11 c 11 c 11 11 36 2 1 s 11 c 11 c=- -c11 11 37 1 1 s 11 c 11 Q 11 11 11 3a 1 1 o 11 c 11 Q 2,4,s-c1 11 11 39 1 1 o 11 0 11 G 4-01 11 11 4o 1 1 o 11 0 11 G 4-sc11 11 11 ENTOMOLOGICAL TESTING METHODS l. House fly [Musca domestica (L.)]

A stock solution containing I00 ug/ml of the toxicant in an appropriate solvent is prepared. Aliquots of this solution are combined with one ml of an acetonepeanut oil solution in a dish, 55 mm. in diameter, and allowed to dry. The aliquots are varied to achieve desired toxicant concentrations ranging from I00 11g per dish to that at which mortality is obtained. The dishes are placed in a circular cardboard cage, closed on the bottom with cellophane and covered on top with cloth netting. Twenty-five female house flies are introduced into the cage and the percent mortality is recorded after 48 hours. LD-50 values are expressed in terms of pg per 25 female flies.

ll. German Cockroach [Bldtlela germanica (Linne)] Ten one-month old nymphs are placed into a circular cardboard cage sealed on one end with cellophane and covered by cloth netting on the other. Aliquots of the lll. Lygus Bug [Lygus hesperus (Knight)] Same as for the German cockroach except that the test concentrations range from 0.05% to that at which 50% mortality is obtained.

lV. Salt-marsh Caterpillar [Estigmene acrea (Drury)] Test solutions are prepared in an identical manner and concentrations are the same as those for the German cockroach (ll). Sections of bitter dock (Rumex ()btusifolius) leaves, l-l.5 inches in length are immersed in the test solutions for 10-15 seconds and placed on a wire screen to dry. The dried leaf is placed on a moistened piece of filter paper in a petri dish and infested with five third-instar larvae. Mortality of the larvae is recorded after 72 hours and the LD-50 values are expressed as percent active ingredient in the aque- 5 ous suspensions. IX. Systemic Tests A. Black bean aphid V. Beet Armyworm [Spodoprem exigua (Hubner)] Aliquots of the toxicant dissolved in an appropriate Same as salt-marsh caterpillar (IV) except that leaves Solvent f Incorporated ""9 1 Pound Samples of sandy of Romaine lettuce (Laruca sativa) are used as the host loam 9 placed mm 1 pmt lce'cream cal-Fons Test plant. concentrations range from l0 ppm of toxicant per pound of soil down to that at which 50% mortality is obtained. Nasturtium (Tropaeolum sp.) plants approxi- Tobacco Budwofm I'S virest'ens -l] mately 2-3 inches tall are transplanted into the treated Same fm Beet Armywormt soil and infested with 50-75 aphids of various ages. Mortality is recorded 72 hours after infestation, and VII. Black Bean Aphid [Aphis fabae (Scop.) 1 3332;??? ggf f ppm of acme Nasturtium (Tropaeolum sp.) plants, approximately B. Two-spotted mite 2-3 inches tall, are transplanted into sandy loam soil in Preparation of the test solution and concentrations is 3 inch clay pots and infested with 50-75 aphids of the same as for the salt-marsh caterpillar test. Pinto mixed ages. Twenty-four hours later they are sprayed, bean (Phaseolus sp.) plants with expanded primary to the point of runoff, with aqueous suspensions of the leaves are placed in the solution so that the roots and toxicant. The suspensions are prepared as in previously major portions of the stem are completely immersed. described tests. Test concentrations ranged from Immediately after, the leaves are infested with 75-100 0.05% to that at which 50% mortality is obtained. Mormites of various ages. Mortality of adults, nymphs and tality is recorded after 48 hours and the LD-50 values eggs is recorded after one week, and LD-SO values are are expressed as percent active ingredient in the aqueexpressed as ppm of toxicant in the aqueous suspenous suspensions. sions.

8 VIII. Two-spotted Mite [Tetranychus urticae (Koch)] Same as for the black bean aphid except that pinto beans (phaseolus sp.) are utilized as the host plant rather than nasturtiums.

TABLE II Two-Spotted Mitc What is claimed is: Cl

1. A compound of the following formula: 1

v .CH2-Q-- l 2 5 1 

1. A COMPOUND OF THE FOLLOWING FORMULA: 